Re: [syzbot] [usb?] KASAN: slab-use-after-free Read in ep_open

[Alan Stern]

On Mon, Aug 17, 2026 at 09:38:02AM -0700, syzbot wrote:
> Hello,
> 
> syzbot has tested the proposed patch and the reproducer did not trigger any issue:
> 
> Reported-by: syzbot+df9e891bf8ea586f846b@xxxxxxxxxxxxxxxxxxxxxxxxx
> Tested-by: syzbot+df9e891bf8ea586f846b@xxxxxxxxxxxxxxxxxxxxxxxxx
> 
> Tested on:
> 
> commit:         8d3ae592 Linux 7.2
> git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/ v7.2
> console output: https://syzkaller.appspot.com/x/log.txt?x=16a91a25580000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=c44651ea7dd2f307
> dashboard link: https://syzkaller.appspot.com/bug?extid=df9e891bf8ea586f846b
> compiler:       gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
> patch:          https://syzkaller.appspot.com/x/patch.diff?x=15790679580000
> 
> Note: testing is done by a robot and is best-effort only.

Greg:

Has this patch ever been queued?

https://lore.kernel.org/linux-usb/ee41fbfd-f368-4a06-95d6-ae9b4267fd82@xxxxxxxxxxxxxxx/

Looks like you can add syzbot's Tested-by: tag, as well as my Acked-by:.

Note that a different patch to fix the same problem was submitted here:

https://lore.kernel.org/linux-usb/20260731230603.4637-1-kartikey406@xxxxxxxxx/

IMO the first patch above is superior.

Alan Stern